Alesis Nanoverb 18-Bit Digital Effects Processor, 1996, made in China

Link: polynominal | soundonsound | Owner's Manual [PDF, Eng] | Owner's Manual [PDF, Ru]

MAIN PCB REV C выглядит иначе

OVERVIEW On the front panel, in all and for all, five rotary potentiometers. The first three are for controlling the input, output and mix level used to adjust the balance between the incoming direct signal and the effects of the NanoVerb)- while the last two ones allow you to choose and adjust the desired effect program. Finally, two LEDs display the power-up of the device and the signal input level.
PSU is a AC-AC 9V (not DC!)

CONNECTION the connection is made via two unbalanced 6.35 mono jack inputs and outputs. It is therefore possible to use it as well in mono as in stereo. A last jack on the rear panel allows you to connect a foot switch (optional) to activate or deactivate the output effects (bypass). No midi sockets, so no remote edit nor save banks.

PRESET sixteen programs which can be selected by turning the rotary selector. These effects are distributed as follows: ten reverbs (three Concert Hall, three Real Room, three Plate Reverb and one Non Linear), a delay, a flange, a chorus, a Leslie-type rotation effect and two combined chorus / reverb effects.

EDIT Quite basic: each program has its own configuration which can be modified using the "Adjust" button e.g you can adjust the delay up to 1270 ms in 10 millisecond steps, control the depth of the chorus or the fall of a reverb. 

Features:
Frequency Response: 40Hz-20kHz, +1/-3dB
Dynamic Range: >90dB Harmonic
Distortion: .02% @ 1kHz @ dBV
Inputs: Number of Channels - 2, Nominal Level -10dBV, Maximum Level +10dBV, Impedance 1MΩ per channel in stereo
A/D-D/A Conversions: Conversion Scheme- 18 bit Delta Sigma, Processor Speed- 3 Million instructions per second, Processor Memory- 64K x 16 bit, Sampling Frequency- 46.875kHz
Outputs: Number of channels- 2, Matrixed Streo, Maximum Level +10dBV Impedance 220Ω
Front Panel: Controls- Input Level, Mix Level, Output Level, Program Selection, Adjust. Indicators- Dual-colored Level LED, Power LED
Rear Panel: Input Left and Right- 1/4", Output Left and Right- 1/4", Power- 5.5mm Barrel Jack
Power Requirements: 9 VAC, 5 Volt Amps external Transformer, UL and CSA Approved
Dimensions: (W x H x D) 5.5" x 1.5" x 4.5"
Weight: approx. 1.25 lbs 0,5 kg

A/D - D/A Conversions: 18 bit Sigma-Delta, 128 times oversampling
A/D converter: 18 bit Sigma-Delta, 8 times oversampling
D/A converter: 1/4" unbalanced
Output:
Number of Channels: 2channels
Format: 1/4 unbalanced
Maximum Level: plus17.5 dBu
Nominal Level: 20 dBV or +4dBu, front- panel adjustable
Output Impedance: 500 ohms
Processor Speed: 3 MIPS (million instructions per second)
Intemal processing resolutiom: 24 bit accumulator
Delay memory: 1270 milliseconds
Reverb effect.: Concert Hall, Real Room, Plate Reverb,Nonlinear
Delay effects: Mono Delay
Pitch effects: True Stereo Chorus, Stereo Flange, Chorus\Room, Rotary